I'm looking to add a 240V 4500W heating element to a kettle.I had previously expected to operate it with a switch, but was informed by a friend that this is a very bad idea & will likely fry the switch in short order.I've looked at the control boxes on highgravitybrew.com & am not entirely impressed.I think my $ would be better spent on something a little more accurate.

Does anyone have the ability to instruct me on how I would go about using a SSR & PID, to control my element?Can anyone provide wiring diagrams, for a very basic build?

I supposed I should also mention that I'm planning to use the element in my boil kettle to maintain mash temperatures, via HERMS coil.So...The element will not be strictly a boil element...I will need to be able to control any step mash temperatures, as well.

I supposed I should also mention that I'm planning to use the element in my boil kettle to maintain mash temperatures, via HERMS coil.So...The element will not be strictly a boil element...I will need to be able to control any step mash temperatures, as well.

Ok, 4500 watts @ 240V is about 20 amps so I recommend a 50amp SSR. You would put the temperature probe in the mash tun and then when you are ready to boil, switch the PID to ON/OFF mode and dial it up to 100%. When the kettle gets going, dial the PID back to whatever % will maintain a rolling boil.

Ok, 4500 watts @ 240V is about 20 amps so I recommend a 50amp SSR. You would put the temperature probe in the mash tun and then when you are ready to boil, switch the PID to ON/OFF mode and dial it up to 100%. When the kettle gets going, dial the PID back to whatever % will maintain a rolling boil.

Try Auberins.com SYL-2352

Very cool...That's the PID I was considering.For the SSR, do I need to go to 50A?Is the 25A Here inadequate?Please, educate me.

why not a 30amp? he'll be considerably less than the 80% max for a 30amp.

Just asking since the 50 will be more expensive.

Paul,The 80% metric is for circuit breakers and electrical wiring. Those SSRs generate a LOT of heat when they are on 100% and we all know heat is bad for electronics. The cost difference between a 25 and 50 amp SSR is negligible compared to what a PIA a failed SSR on brewday is going to be.

why not a 30amp? he'll be considerably less than the 80% max for a 30amp.

Just asking since the 50 will be more expensive.

Paul,The 80% metric is for circuit breakers and electrical wiring. Those SSRs generate a LOT of heat when they are on 100% and we all know heat is bad for electronics. The cost difference between a 25 and 50 amp SSR is negligible compared to what a PIA a failed SSR on brewday is going to be.

ah - thanks dave - had no idea.

I just looked and the panel I am buying has 2 5500W and 2 40amp SSRs with a giant heat sink, so its probably in the middle of what you're recommending.

learn something new everyday!

Logged

The happiest people don’t necessarily have the best of everything; they just make the best of everything they have.

I just looked and the panel I am buying has 2 5500W and 2 40amp SSRs with a giant heat sink, so its probably in the middle of what you're recommending.

The GIANT heatsink is the key. 5500w@240V is 23amps so you're pretty close to double WITH a heatsink. I am using 120V with my system(2X11.5 amps with one 40 and one 25A SSR it's great for the RIMS buy it takes 2.5-3hrs to heat up my HLT. I just use aluminum supports to mount my SSRs and that seems to be enough heatsink. Mounting the SSRs on a metal box makes the box a heatsink too.

This is what I'm looking to do as well, but bigger. With my setup, it's 4 heat sticks, 2 for the hlt and 2 for the boil kettle, 4.5kw each, so at 230v that figures to 25 amps per stick, right? In terms of buying SSRs, does that mean I need four 25 amp SSRs, or can I get by with two 50 amp SSRs? For the total load, if I'm running the boil kettle and the HLT at the same time, does that mean the whole system will draw 100 amps? (calculations include 80% safety thinger mentioned above) Should I just never ever have both turned on?